Roof structure



,UNITED STATES HERBERT MARKS, F

R003? STRUCTURE.

.. ma il may cont-era.'

lle it known at. l. H- enr l filli States, and a resident ie county' of iillegheny have invented a i in loof fit-rnc is a .Specificaa. l lhis ihren:Y lts object is which to roof structures. a roof str cture forms an efficient is light in .reight, low can be easily and cheaply provide is fire proof, which heatinsulator. which in cost, which erected, and which nevertheless strong and durable.

stated the invention comprises containingmetallic angle tibstant-ially monolithic and gypsum or similar maed and assembled in the novel v g described.

accompanying drawings Figure l ertical section of an inclined roof conin accordance with the invention; l shows a nortion of l on an ennd Fig. a section taken .D to that of rigs. l and 2 on a. stili 'larger so le.

The invention is applicable to a roof of any type, and in the drawings is shown as applied in double sloping or ridge roof. ln the drawings l indicates a suitable frame ti s or part bf the bui 1ing on which the i roof is supported and l indicates purlins for stmportnng` the roof :sti 'i parts are illust l steel. and obviously can be of any material` character or design, dcpemlin` upon the hind and of the roof.

The roof structure proper comprises a plurality of angle bars, specifically of the type known as 'lm-hars, P, `which rest with their base flanges upon the purlins and are suit able secured thereto and with their legs pro- 'uiecting upwardly, 'llhese'T-bars form the base for the roof structure proper and Will be spaced sutliciently close that the distance therein can be bridged by ordinary sizes of gypsum boards which are articles irc proper. ill as foi-mcd plaster or of commercial manufacture and sale, `beingT generally composed of molded grypsum or4 the like. and generally are quite. thin. usually about three-eighths of an inch in thickness'. The plaster or gypsum boards are shown at el, having their side edges restingy upon and supported by the horizontal flanges 5 of the Specification of Letters Patent.

4it-H31 filed August 31, 1929. Serial No. 407,189.

Vatout-cd No f i) -Y El`bars il, shown in Fig. 3. These gypsu i boards can be chosen of any suitable'lengrth, but preferable of a length substantially equal to the space between adjacent purlins 2, but instead of extendinpr from pnrlin to purlin they are so placed that their central portions are substantially above pin'lins, with their end portioi'is meeting about midway between adjacent purlins. To support Athe end portions of these plaster boards it is preferred to use small angle members l, of a length equal to the distance between adjacent T-bars 3, and havingr their ends restingupon the flanges 5 of said T-bars, as a result of which the thin plaster boards are supported not only at their side edges but also at their end edges. Obviously in lieu of `the T-bars 3, a pair of angle bars or channels placed bach` to bach may be utilized. and likewise instead of the angle bars o placed bach' to back as shown, Vsmall nl`bars or channels may be used.

The plaster boards l, 1)laced in the manner described, serve as centeringif for the forniation of the roof slab. and also as the lower facing of the roof'slab. The. roof slab is formed from suitable cemcntitious material. such as gypsum. which is mixed with. the proper proportion of water and then molded directly in place, thatis. by beingpoured upon the centering formed by the plaster boards l. The composition of this cementitions material is preferably the same z that of the plaster boardsbut in any event is of such nature that when poured in place it bonds on to the plaster boards so that the latter and the solidified cementitious material form a unitary or monolithic slab Preferably this slab will be reinforced by able metallic reinforcement 7. preferably a metallic mesh, such as metallic lath, wire mesh. or the like. This metallic reinforcement may be in the form of sheets extendingr acrossv` and resting` upon the upper edges of theaugle bars (i and being` supported b v the latter and thereby properly spaced from the plaster boards L-thc upward projection of the angle bars 6 preferably being somewhatgreater than the thickness of the plaster boards, but terminating' below the center of the upwardly project-ing leg of the 'l'.bars, so that the metal reinforcement Will be embedded close tothe lower face of the slab. This metallic mesh will be either one continuous Strip extending from the 'eaves to the ridge of the-roof, or may be composed of a number of pieces, the ends of `which are overlapped so that when embedded in the cementitious material it has the same reinforcing effectas though a continuous strip of material were used; also if desired, the edge portions of the metallic reinforcement may be bent upwardly and made to overlap the upper edges of the T bars 3, as shewn at 8, Fig. 3, seas to also secure a continuous, additional transverse tie; or the strips of reinforcement may run across the T bars 3, and bend down between the T bars, with their edges overlapping to give in effect; a continuous reinforcement, when embedded in the cementitious material, Yfrom eave to ridge and also transversely or" the roof. The cementitious material which is poured onto the centering plaster boards 4 readily passes through this metal mesh and bonds to the plaster boards. Such material will be filled in to a depth somewhat greater than that of the T bars 3 so that no portion of the metal frame is exposed on the top surface.

Thefroof structure described is of simple construction, is easy and cheap to construct, is light, and with all is very strong, inasmuch as the entire structure, including the plaster boards, forms a monolithic slab which is reinforced for its entire length andl width, and is, therefore, capable of standing a very considerable load. This slab is reinforced not only by the metal mesh described, but also by the T bars 3 and bars 6 which become 4thoroughly embedded and bonded in the cementitious material. The" consequence is that the metal members canibe of' light cross section, and the slab 0f minimum thickness.

Since the plaster boards which form the bottom surface off this slab serve as centering, the usual centering for erecting roofs of' this kind can be entirely dispensed with, thus making a great saving in cost of erection.

The top surface of this roof structure will be suitably Water-proofed, by any of the usual water-proofing methods, such as by applying thereto a coating of asphaltum or the like, and can be finished in any desired way of' finishing roofs of this kind, such by providing the same with a gravel o r other surface.

In case the cementitious material is such as to form a strong slab, such as cement, the members 4 need not necessarily be of a composition to bond With' the cementitious malangle members.

ported on said terial, but may be' the so-called commercial.'

beaver board 0r`like thin board.

1. A roof of thecharacter describd, comprising purlins,-m'etal angle 'mem er-s supportedzon-the purlins and presenting oppositely projecting flanges, small metal angle members located intermediate the purlins and extending between the first named angle members and resting on the flanges of the latter, and also presenting oppositely projecting lflanges, thin composition boards supported at their sides on the flanges of the first named angle members and at their ends on the fianges of the second named angle members, metallic reinforcement supported on the second named angle members,

and a cementitious slab molded in place on the composition boards to such thickness as to project materially above the first named 2. A roof of prising purlins, ported on the same and presenting oppositely projecting fia'nges, small metal angle members extending between the first named ahgle members and resting on the flanges of the latter and also presenting oppositely projecting flanges, plaster boards supported on their side edges on the flanges of the first named angle membersand at their end edges on the flanges of the second named angle members, and a cementitious body molded in place on 4vthe plaster boards and bonding therewith and extending above the said lirst named angle'members, thereby forming a monolithic rooi'v slab.

3. A 'roof of the character described, comprising purlins, metal angle members sup ported on the purlins and presenting oppo sitely projecting flanges, plaster boards supfianges, metal reinforcing fabric supported over and in spiced relation to said plaster boards and fo ling a continuous reinforcement for the length of said angle members and a cementitious body molded onto the plaster boards and bonding I have hereunto HERBERT E. MARKS.

l/Vitness:

HOWARD L. SNN/nm'.

the character described, com-'f metal anglemembers sup-y 

